CN1961263A - Hologram reproduction device and hologram reproduction method - Google Patents
Hologram reproduction device and hologram reproduction method Download PDFInfo
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- CN1961263A CN1961263A CNA2005800176525A CN200580017652A CN1961263A CN 1961263 A CN1961263 A CN 1961263A CN A2005800176525 A CNA2005800176525 A CN A2005800176525A CN 200580017652 A CN200580017652 A CN 200580017652A CN 1961263 A CN1961263 A CN 1961263A
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- G—PHYSICS
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- G02B5/32—Holograms used as optical elements
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
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Abstract
There is provided a hologram reproduction device whose size can be reduced. The hologram reproduction device reproduces recorded information from a recorded recording medium obtained by recording a diffraction grating area generated by interference between a reference light beam and a signal light beam when the reference light beam which is coherent and the signal light beam which has been spatially modulated in accordance with recording information are applied on the same optical axis to the recording medium. The hologram reproduction device includes: a light source unit for emitting a coherent light beam; a light beam irradiation unit for irradiating the light beam to the diffraction grating area of the recording medium; a light collecting unit for collecting the reproduction light beam reproduced by irradiating the light beam to the diffraction grating area, toward the convergence position; an incident light processing unit arranged at the convergence position for separating the Fourier 0-dimension component from the reproduction light beam and the diffraction light component from the reproduction light beam; and a detection unit for detecting the recording information from the diffraction light component.
Description
Technical field
The present invention relates to utilize the hologram reproducing method and the information reproduction apparatus of holographic memory.
Background technology
As the digital information recording system of the principle of having utilized hologram, known have a volume hologram chart recording system.The feature of this system is that recorded information is recorded on the recording medium that is made of photochromicss such as photorefractive materials as change of refractive.
One of existing hologram record reproducting method has the use Fourier transform to carry out the method for record-playback.
As shown in Figure 1, in existing 4f system hologram recording recording/reproduction apparatus, will beam splitter 2, be divided into light beam 1a and light beam 1b from the laser beam 1 that LASER Light Source LD sends.Light beam 1a makes beam diameter enlarge in optical beam expander BX, and as directional light, shines among the spatial light modulator SLM of panel etc. of TFT liquid crystal indicator (LCD) of infiltration type.Spatial light modulator SLM will be received as electric signal by the information that should write down after scrambler 3 signal transformations, and forms 2-D data, i.e. the recorded information of light and shade bidimensional dot pattern etc. in the plane.Light beam 1a spatially carries out optical modulation after seeing through spatial light modulator SLM, become the signal beams that comprises the data-signal composition.The signal beams 1a that has comprised the dot pattern signal content is by leaving the fourier transform lens 4 that its focal length f places, and the dot pattern signal content is by Fourier transform, and optically focused is in recording medium 5.On the other hand, light beam 1b after cutting apart in beam splitter 2 imports in the recording medium 5 by level crossing 6,7 as reference light, report to the leadship after accomplishing a task and interfere and form light interference pattern in the inside of the light path of signal beams 1a and recording medium 5, and light interference pattern integral body is carried out record as the diffraction grating of change of refractive etc.
Like this, come the diffraction light of the dot pattern data of free coherent parallel lights illumination to come imaging by fourier transform lens, revise its focus face, it is the distribution on the Fourier blade face and after the distribution and the coherent reference interference of light with the result of Fourier transform, its interference fringe being recorded near the focus the recording medium.After first page end of record (EOR), with rotating mirror 7 rotation scheduled volumes, and make the parallel mobile ormal weight in its position, and the incident angle of reference beam 1b relative record medium 5 is changed, and write down second page with same processes.Like this by carrying out record successively, and carry out angular multiplexed record.
On the other hand, when reproducing, carry out inverse Fourier transform and playback light dot pattern picture.In information regeneration, as shown in Figure 1, for example come the light path of truncated signal light beam 1a, and only reference beam 1b is shone in the recording medium 5 by spatial light modulator SLM.During reproduction, the rotation of combined planar mirror and straight line move position and the angle variation that makes level crossing and control, and the reference beam when making it and having write down the page or leaf that reproduces is identical incident angle.At the opposition side of the light incident side of the signal beams 1a of the recording medium 5 of having shone reference beam 1b, the reproduction ripple of the flashlight that is write down has appearred reproducing.If should reproduce ripple imports to inverse Fourier transform lens 8, carry out inverse Fourier transform, then can playback light dot pattern signal.Further, the image detection sensor 9 by the focal length position receives this dot pattern signal, and after being converted to the digital signal of electricity again, sends to demoder 10, then reproduces original data.Like this, carry out multiplexing recording (TOHKEMY 2001-184637 communique) in the volume about several mm angle.
The mode of above-mentioned multiplexing recording needs the correct control of rotating mirror 7 grades, simultaneously, the problem of the miniaturization of very difficult implement device is arranged.Therefore, proposed by using spherical wave, parallel moving recording medium and recording optically system carry out the method (D.Psaltis of multiplexing recording, M.Levene, A.Pu, G.Barbastathis and K.Curtis, " Holographic storageusing shift multiplexing ", OPTICS LETTERS, Vol.20, No.7, (April 1,1995) p.782-784), Fig. 2 represents to use such principle to carry out spatial reuse, and further makes reference beam and the coaxial structure of signal beams.
Existing hologram recorder as shown in Figure 2 has LASER Light Source LD, optical beam expander BX and first half prism that penetrates coherent light beam 1.The first half reflection prism HP1 sees through the light beam 1 edge direction identical with the optical axis of this light beam of institute's incident and reflects and separating light beam along the direction that this optical axis is vertical relatively.
The light beam that has seen through the first half reflection prism HP1 is the signal light beam, shines, and it is incided among the spatial light modulator SLM.Signal after by the spatial light modulator SLM that has shown data, carries out optical modulation with light beam, and becomes and comprise the signal beams 1a of data as luminous point matrix composition.Project signal light beam 1a incides among the second half reflection prism HP2 it.
Reflect by the first level crossing M1 and the second level crossing M2 by the reference beam 1b after the first half reflection prism HP1 reflection, and incide among the second half reflection prism HP2.
The signal beams 1a from spatial light modulator SLM is crossed in the second half reflection prism HP2 transmission, to the vertical direction of the optical axis of relative this light beam, promptly, the direct of travel identical with signal beams 1a reflect the reference beam 1b from the second level crossing M2.
Shine in the fourier transform lens 4 from the signal beams 1a of the second half reflection prism HP2 and the mixed light beam of reference beam 1b.The luminous point matrix composition of 4 couples of signal beams 1a of fourier transform lens carries out Fourier transform, and optically focused makes it assemble in focus to hologram record medium 5.
During reproduction, identical with the conventional example of above-mentioned Fig. 1, come the light path of truncated signal light beam 1a by spatial light modulator SLM, and only to recording medium irradiation reference light, thereby the playback light of the diffraction grating that forms in the comfortable recording medium imports in the inverse Fourier transform lens 8 and is received in the future, and reproduces original data.Owing in this structure, only carry out multiplexing recording, be applicable to tabular recording medium easily so have, the advantage of especially discoid recording medium shape by parallel mobile media.But, under the situation of this structure, when information regeneration, not not the having diffracted composition and transmit along same optical axis of reference light from the diffraction light component of diffraction grating, further, compare with the diffraction light intensity from diffraction grating generally speaking, the intensity that does not have diffracted composition of reference light is big.The problem that therefore, the reading performance deterioration of reproducing signal is arranged.
Summary of the invention
Therefore, in the problem to be solved in the present invention, can enumerate hologram reproducing method that the hologram record of Miniaturizable medium are provided and hologram reproducing apparatus, hologram reproducing as an example.
Hologram reproducing apparatus, hologram reproducing based on certain feature of the present invention, to on roughly the same optical axis, comprise relevant reference light composition and shone to recording medium by the writing light beam of the flashlight composition of spatial modulation according to recorded information, to reproduce above-mentioned recorded information from the diffraction grating area that has write down the interference between above-mentioned reference light composition and the above-mentioned flashlight composition, it is characterized in that, comprise: light source portion, penetrate relevant light beam; Described light beam is shone to the described diffraction grating area of described recording medium in light beam irradiates portion; Light collecting part will be by shining reconstruction beam that described light beam reproduces to converged position optically focused to described diffraction grating area; Incident light processing unit is provided with on described converged position, and separates 0 composition of Fourier of described reconstruction beam and the diffraction light component of described reconstruction beam; And test section, from described diffraction light component, detect described recorded information.
Hologram reproducing method based on another feature of the present invention, to on roughly the same optical axis, comprise relevant reference light composition and shone to recording medium by the writing light beam of the flashlight composition of spatial modulation according to recorded information, to reproduce above-mentioned recorded information from the diffraction grating area that has write down the interference between above-mentioned reference light composition and the above-mentioned flashlight composition, it is characterized in that, comprise: irradiation process, to the relevant light beam of described diffraction grating area irradiation of described recording medium; The optically focused operation, the reconstruction beam that will reproduce by described irradiation process is to converged position optically focused; The incident light treatment process by the incident light processing unit that is provided with at described converged position, is separated 0 composition of Fourier of described reconstruction beam and the diffraction light component of described reconstruction beam; With the reproduction operation, from described diffraction light component, reproduce described recorded information.
Description of drawings
Fig. 1 is the schematic configuration diagram of the existing hologram record playback system of expression;
Fig. 2 is the schematic configuration diagram of the existing hologram record playback system of expression;
Fig. 3 is the schematic configuration diagram of explanation hologram recorder of recorded information on hologram record medium used in the present invention;
Fig. 4 is the schematic configuration diagram of the embodiment of explanation hologram reproducing apparatus, hologram reproducing of the present invention;
Fig. 5 is the curve and the curve map of action of employed incident light processing unit in the hologram reproducing apparatus, hologram reproducing of explanation embodiments of the invention;
Fig. 6 is the schematic configuration diagram of the variation of explanation hologram reproducing apparatus, hologram reproducing of the present invention;
Fig. 7 is the schematic configuration diagram of the variation of explanation hologram reproducing apparatus, hologram reproducing of the present invention;
Fig. 8 is the schematic configuration diagram of the variation of explanation hologram reproducing apparatus, hologram reproducing of the present invention;
Fig. 9 is curve and the curve map that the action of the incident light processing unit of using in the hologram reproducing apparatus, hologram reproducing of embodiments of the invention is described;
Figure 10 is the schematic configuration diagram of the variation of explanation hologram reproducing apparatus, hologram reproducing of the present invention;
Figure 11 is the schematic configuration diagram of the variation of explanation hologram reproducing apparatus, hologram reproducing of the present invention;
Figure 12 is the schematic configuration diagram of the variation of explanation hologram reproducing apparatus, hologram reproducing of the present invention;
Figure 13 is curve and the curve map that the action of the incident light processing unit of using in the hologram reproducing apparatus, hologram reproducing of embodiments of the invention is described;
Figure 14 is the schematic configuration diagram of the variation of explanation hologram reproducing apparatus, hologram reproducing of the present invention;
Figure 15 is the schematic configuration diagram of the variation of explanation hologram reproducing apparatus, hologram reproducing of the present invention;
Figure 16 is the schematic configuration diagram of the variation of explanation hologram reproducing apparatus, hologram reproducing of the present invention;
Figure 17 is the schematic configuration diagram of the variation of explanation hologram reproducing apparatus, hologram reproducing of the present invention;
Figure 18 is the schematic configuration diagram of explanation variation of the hologram recorder of recorded information on hologram record medium used in the present invention.
Embodiment
Below, hologram reproducing method of the present invention and hologram reproducing apparatus, hologram reproducing are described with reference to the accompanying drawings.
＜hologram record medium 〉
The hologram record medium that use in hologram reproducing method of the present invention and the hologram reproducing apparatus, hologram reproducing comprise will be relevant the reference light composition and according to recorded information spatially the writing light beam that on roughly the same optical axis, comprises of modulated signal light composition shine on the recording medium, write down the recording medium portion of the diffraction grating area that the interference between this reference light composition and this flashlight composition forms.
This recording medium portion is made of the photochromics of light transmission.This photochromics uses and has light conduction and electric optical effect (represent be directly proportional with the once item that applies electric field variations in refractive index), and alms giver (donor) energy level and being subjected to is led so-called photorefractive material that (acceptor) energy level is present in the material of the dark level of band gap, hole burning material, photochromic material (photochromicmaterial), photopolymer material etc.That is, this photochromics uses and can preserve the material of light intensity distributions.Because photorefractive material can not use chemical reaction etc. to write the diffraction efficiency grating in inside, so be applicable to the storer that can realize reversible rewriting.Photorefractive material has: AlGaAs/GaAs, InGaN/InGaN quantum well etc. are arranged in the semiconductor material, LiNbO is arranged in the dielectric material
3Deng, in the organic material charge transfer complex organic photosensitive material (comprising coloured material) that comprises PVK (Polyvinyl carbazole)/TNF (trinitro-fluorenone) etc. etc.Photopolymer material has OmniDex of DuPont company for example etc.
On the hologram record medium that comprise aforesaid recording medium portion, record writes down recorded information thus corresponding to by shining reference beam for example and having carried the diffraction grating area that the interference of light that the signal beams of answering recorded information produces distributes.For example, by hologram recorder as shown in Figure 3, and on these hologram record medium, write down recorded information.
Hologram recorder comprises the LASER Light Source LD that penetrates coherent light beam.LASER Light Source LD for example uses DBR (the Distributed BraggReflector: laser instrument distributed Bragg reflector) near infrared laser wavelength 850nm.
From LASER Light Source LD outgoing beam 11, configuration optical gate SHs and optical beam expander BX on the light path of light beam 11.Optical gate SHs controls by controller (cont.), the time that control bundle 11 is passed through, is light beam to the irradiation time of recording medium described later portion.The diameter that optical beam expander BX enlarges by the light beam behind the optical gate SHs 11 becomes parallel rays.
The light beam 11 that becomes parallel rays by optical beam expander BX incides among the first half reflection prism HP1, the first half reflection prism HP1 makes the light beam 11 of institute's incident after the direction reflection that the direction identical with the optical axis of this light beam sees through and relative this optical axis in edge is vertical, separating light beam.
The light beam that sees through the first half reflection prism HP1 becomes the signal light beam, and is shone, and it is incided among the spatial light modulator SLM.Spatial light modulator SLM receives the data of supplying with from scrambler 12 (two-dimentional dot pattern data) corresponding to the electricity of the record data that should write down, and can show the luminous point matrix signal of light and shade.Signal after by the spatial light modulator SLM that has shown data, carries out optical modulation with light beam, and becomes and comprise the signal beams 11a of data as luminous point matrix composition.Project signal light beam 11a makes it incide the second half reflection prism HP2.
Reference beam 11b by first half reflection prism HP1 reflection is reflected by the first level crossing M1 and the second level crossing M2, and incides among the second half reflection prism HP2.
The second half reflection prism HP2 sees through the signal beams 11a from spatial light modulator SLM, and to the vertical direction of the optical axis of this light beam relatively, promptly the direct of travel identical with signal beams 11a reflects the reference beam 11b from the second level crossing M2.Therefore, the second half reflection prism HP2 becomes the interflow portion that makes signal beams 11a and reference beam 11b interflow.
To shine in the fourier transform lens 13 from the signal beams 11a of the second half reflection prism HP2 and the mixed light beam of reference beam 11b.The luminous point matrix composition of 13 couples of signal beams 11a of fourier transform lens carries out Fourier transform, and near the recording medium portion (not shown) of hologram record medium 14 optically focused, it is assembled in focus.In the example of Fig. 3, described at the rear of recording medium 14 and be focused at focus, but also can be focused at focus in the place ahead of recording medium.In addition, if the thickness of recording medium portion (not shown) is enough, then also within it portion be focused at focus.In addition,, then dispose hologram record medium 14, make and signal beams 11a and reference beam 11b are incided on the plane of incidence of this recording medium portion with predetermined incident angle (for example zero degree) from fourier transform lens 13 if optical gate SHs opens.In addition, spatial light modulator SLM is configured on the focal length position of fourier transform lens 13.In addition, on the movable table 15 that hologram record medium 14 is installed in as the support that moves it, then change the irradiation position of the relative hologram record medium of reference beam successively, thereby can write down a plurality of diffraction grating area with signal beams by making movable table 15 actions.In addition, movable table 15 can be connected on the controller position of control hologram record medium after the slave controller reception control signal.
Recording of information for the hologram record medium in the aforesaid hologram recorder carries out as follows.The light beam 11 that penetrates from LASER Light Source LD incides among the first half reflection prism HP1 after seeing through and opening the optical gate SHs and optical beam expander BX of state.The first half reflection prism HP1 is separated into the signal of advancing along the direction identical with the optical axis of light beam 11 with light beam and the reference beam of advancing to the direction vertical with this optical axis.
Signal light beam with after the first half reflection prism HP1 is crossed in the transmission that the optical axis equidirectional of light beam 11 before separate is advanced receives from the two-dimentional dot pattern data of scrambler 12 supplies, the spatial light modulator SLM of the luminous point matrix signal of transmission display light and shade.This signal that has seen through spatial light modulator SLM uses light beam by optical modulation, and becomes the signal beams 11a that data are comprised as luminous point matrix composition.Signal beams 11a is incided among the second half reflection prism HP2.
To with separate before the reference beam 11b that advances of the vertical direction of the optical axis of light beam 11 vertically reflect by the first level crossing M1 and the second level crossing M2, and incide among the second half reflection prism HP2.
The second half reflection prism HP2 makes signal beams 11a and reference beam 11b interflow, advances along roughly the same optical axis, and signal beams and reference beam are shone in the fourier transform lens 13.Fourier transform lens 13 shines the recording medium portion (not shown) of hologram record medium 14 with signal beams and reference beam, and forms the light interference pattern that is formed by signal beams and reference beam in this recording medium portion.The diffraction grating area of the change of refractive that will distribute corresponding to the light intensity of this light interference pattern etc. is recorded in this recording medium portion.
Record is by the transcriber and the reproducting method of the hologram record medium that aforesaid hologram recorder write down below.
＜embodiment 1 〉
As shown in Figure 4, hologram reproducing apparatus, hologram reproducing 16a comprises the LASER Light Source LD that penetrates coherent light beam.LASER Light Source LD can be can be from the light wavelength of hologram record media representation recorded information, also can be the light source of the laser that for example employed light wavelength is identical when having write down hologram on above-mentioned hologram record medium.As LASER Light Source LD, for example can use DBR (Distributed Bragg Reflector) laser instrument near infrared laser wavelength 850nm.
From LASER Light Source LD outgoing beam 17, and on the light path of light beam 17, arranged in order optical gate SHs, optical beam expander BX, the first object lens 18a and hologram record medium 14.
Optical gate SHs is controlled by controller (cont.), and the time of coming control bundle to pass through by this controller is promptly to the beam irradiating time of hologram record medium described later.
The diameter that optical beam expander BX enlarges the light beam 17 that has passed through optical gate SHs becomes parallel rays.
The first object lens 18a carries out optically focused to the " loaded " position of the recording medium portion (not shown) of hologram record medium 14, and the reference beam that makes focus as the light beam 17 of reference light beam become when writing down is identical.In addition, optical gate SHs, optical beam expander BX and the first object lens 18a form light beam irradiates portion.
The second object lens 18b optically focused reconstruction beam, and act as fourier transform lens.Configuration comprises the incident light processing unit 21 of the optical element that photochromics that at least one characteristic value of the light intensity, reflectivity, absorptivity and the transmitance that depend on incident beam changes constitutes on spot position.As this photochromics, the permeable material of the photosensitivity of the characteristic value that the transmitance of the transmitance when using the irradiation with light beam during than non-irradiation is low.
This permeable material as photosensitivity has oxide material, photochromic material, has the quantum confining bed of quantum well structure and thermochromic materials etc.
The oxide material usually irradiation of the non-irradiation or the not enough predetermined light intensity (time) is transparent, central temperature height at light beam, surpassed the region generating reduction reaction precipitating metal particle of certain temperature and become opaque, the oxidation once more and revert to transparent oxidized compound if temperature descends then.For example, can list silver oxide etc.
The photochromic material usually irradiation of the non-irradiation or the not enough predetermined light intensity (time) be transparent, but because of the absorption of illumination beam (core that intensity is strong) changes to unsettled opaque state, the weakened as if light beam then returns to original pellucidity.
Quantum confining bed with quantum well structure is because of the quantum blocking effect, and reflectivity improves in the strong core of the intensity of light beam, but lowland inhibitory reflex rate very in the peripheral region a little less than beam intensity.
The part of the thermochromic materials usually irradiation of the non-irradiation or the not enough predetermined light intensity (time) be transparent, only surpass become in the zone of uniform temperature opaque, if the temperature reduction then reverts to original pellucidity.
The incident light processing unit 21 that comprises the optical element of material formation with one of aforesaid characteristic, reflectivity or absorptivity in the strong position incident light processing unit of the intensity of incident beam are higher than common, so locational the see through intensity strong in the intensity of incident beam reduces.By adopting this effect, incident light processing unit 21 can be contributed to separating 0 light and the diffraction light in the reconstruction beam.The incident light processing unit that on the position with the weak strength of incident beam as mentioned above incident light is seen through is called the incident light processing unit of infiltration type.
On the light path of the light that has seen through incident light processing unit, dispose the second inverse Fourier transform lens 20b and picture detecting sensor 22 successively.The second inverse Fourier transform lens 20b and the coaxial configuration of the second object lens 18b.In addition, be configured in as detecting sensor 22 on the focal length position of the second inverse Fourier transform lens 20b, constitute by array of charge coupled cell CCD or complementary metal film semiconductor device etc. etc.Connect demoder 23 on the picture detecting sensor 22, connect controller on the demoder 23.
In aforesaid hologram reproducing apparatus, hologram reproducing 16a, under the situation that is reproduced in the recorded information that writes down on the hologram record medium, enforcement will shine the irradiation process of the recording medium portion (not shown) of hologram record medium 14 from the light beam 17 of LASER Light Source LD through optical gate SHs, optical beam expander BX, the first object lens 18a.In this irradiation process, from having shone this recording medium portion of reference beam, generate reconstruction beam corresponding to diffraction grating (0 light and reproduce after diffraction light).
This reconstruction beam is imported among the first inverse Fourier transform lens 20a and the second object lens 18b, and further implement by the second object lens 18b optically focused in the optically focused operation to spot position.The reconstruction beam of optically focused shines incident illumination part 21 on this converged position in this optically focused operation.
After the optically focused operation, use incident light processing unit 21 to separate the incident light treatment process of 0 light and the diffraction light of reconstruction beams.Here, (b) action the when incident light processing unit of the infiltration type that constitutes of the photochromics of characteristic value that the transmitance the when transmitance when representing to have irradiation is than non-irradiation is low (the transmitance high characteristic value of the transmitance during non-irradiation when penetrating) is reproduced of Fig. 5 (a).
In the incident light processing unit of reconstruction beam pre-irradiation (Fig. 5 (a)), incident light processing unit 21 uniformly has high transmitance.
In the part that is in the incident light processing unit 21 on the converged position of the reconstruction beam after assembling (0 light and diffraction light), reconstruction beam is decomposed into the Fourier composition by the second object lens 18b that act as fourier transform lens.Because the unmodulated composition in the reconstruction beam, promptly reference light (composition) is 0 composition of Fourier, thus converge on the core R1 (Fig. 5 (b)) of incident light processing unit 21, and form the high part of light intensity.Component distributing after the modulation in the reconstruction beam is in the outside of the core R1 of incident light processing unit 21, and light intensity is less high.If the threshold value TH that the transmitance of incident light processing unit 21 is reduced is set between the light intensity of the light intensity of R1 part and periphery, then can only make unmodulated composition, promptly the reference light composition reduces.After having carried out aforesaid incident light treatment process, the diffraction light that sees through the reconstruction beam of incident light processing unit imports in the picture detecting sensor 22 the reproduction operation of carrying out the reproduction of recorded information through the second inverse Fourier transform lens 20b shown in Figure 4.Picture detecting sensor 22 receives the dot pattern picture that the diffraction light by reconstruction beam forms, and after being converted to electric digital signal, is sent to demoder 23, then reproduces original record data.
As mentioned above, by the action of incident light processing unit 21, the light quantity of reproducing unwanted 0 light is reduced, it is easy that the detection of information reproduction becomes.
In the above-described embodiments, the photochromics of the characteristic value that the transmitance of the transmitance that will have non-when irradiation when penetrating is high is used for incident light processing unit, but should know that also can to use this photochromics be light transmission and compare the material of the reflectivity during irradiation and at least one rising of absorptivity during with non-irradiation.
＜embodiment 2A 〉
As shown in Figure 6, the hologram reproducing apparatus, hologram reproducing 16b of the hologram record medium of applicable reflection-type disposes LASER Light Source LD that penetrates coherent light beam and the light beam irradiates portion that is made of optical gate SHs, optical beam expander BX, the first half reflection prism HP1 and the first object lens 18a on same optical axis.
Optical gate SHs is controlled by controller, the time that control is passed through from the light beam of beam light source LD.The diameter that optical beam expander BX enlarges the light beam 17 that has passed through optical gate SHs becomes parallel rays.The first half reflection prism HP1 makes the light beam from LASER Light Source LD see through and this light beam is projected on the first object lens 18a.
First this light beam of object lens 18a optically focused, and become reference beam.Hologram record medium 14 are configured on the converged position of reference beam.Hologram record medium 14 have and have write down recorded information as the recording medium portion (not shown) of diffraction grating area and the reflecting part (not shown) that is made of light reflecting material, and are loaded on the movable table 15 of the support that moves as the position that makes these medium.
This recording medium portion is by the irradiation reference beam, and generate reconstruction beam corresponding to this diffraction grating area (0 light and reproduce after diffraction light).The reconstruction beam that is generated is by reflecting with this reflecting part that is provided with on the light incident side opposition side of reference beam, and along advancing with the incident direction reverse direction of reference beam.This reconstruction beam is directed into the first object lens 18a and the first half reflection prism HP1.At this moment, act as the inverse Fourier transform lens for the reconstruction beam first object lens 18a.
The first half reflection prism HP1 vertically, promptly the direct of travel vertical direction with reconstruction beam reflects this reconstruction beam, and it is separated from light path of reference beam.This reconstruction beam comes optically focused once more by the second object lens 18b.As mentioned above, the first object lens 18a, the first half reflection prism HP1 and the second object lens 18b constitute the playback light guide portion, and the first object lens 18a and the first half reflection prism HP1 that constitute light beam irradiates portion are public.
The incident light processing unit 21 of configuration infiltration type on the spot position of the second object lens 18b disposes the first inverse Fourier transform lens 20a and picture detecting sensor 22 successively on the light path of the light that has seen through incident light processing unit 21.The first inverse Fourier transform lens 20a and the coaxial configuration of the second object lens 18b.In addition, be configured in as detecting sensor 22 on the focal length position of the first inverse Fourier transform lens 20a, and receive by the light of the first inverse Fourier transform lens after by inverse Fourier transform.Connect demoder 23 on the picture detecting sensor 22, connect controller on the demoder 23.
As above the reproducting method of the recording information data among the hologram reproducing apparatus, hologram reproducing 16b of Gou Chenging comprises, at first will shine the irradiation process of hologram record medium 14 from the light beam of LASER Light Source LD through optical gate SHs, optical beam expander BX, the first half reflection prism HP1, the first object lens 18a.In this irradiation process, from the hologram record medium that shone reference light generate reconstruction beam corresponding to the diffraction grating that writes down in recording medium (0 light and reproduce after diffraction light).This reconstruction beam with the reflecting part (not shown) of the light incident side opposition side setting of the reference beam 17 of hologram record medium 14 in reflect.
Behind irradiation process, this reconstruction beam imports to the first object lens 18a, and to the first half reflection prism HP1 channeling conduct.The first half reflection prism HP1 vertically reflects this reconstruction beam.This reconstruction beam carries out the optically focused operation by the second object lens 18b optically focused in the incident light processing unit 21 of infiltration type.
The incident light processing unit 21 of infiltration type reduces the transmitance of part of 0 light of irradiation playback light, and blocks light 0 time, and diffraction light is seen through, and separates the incident light treatment process of 0 light and diffraction light.Import in the picture detecting sensor 22 through the first inverse Fourier transform lens 20a with the diffraction light of playback light after 0 light separates.Picture detecting sensor 22 receives the dot pattern picture that the diffraction light by reconstruction beam forms, be converted to electric digital signal again after, send to demoder 23, then reproduce original data.
＜embodiment 2B 〉
The hologram reproducing apparatus, hologram reproducing of embodiment 2B as shown in Figure 7, except the first half reflection prism HP1 with hologram reproducing apparatus, hologram reproducing 16b shown in Figure 6 is replaced into polarisation beam separator PBS, and between the polarisation beam separator PBS and the first object lens 18a, be provided with outside 1/4 wavelength plate λ/4, identical with the structure of the above embodiments 2A.It is also identical to reproduce operation.
Separated part that constitute with 1/4 wavelength plate λ/4 by being provided with, that separates reconstruction beam from the light path of reference beam by polarisation beam separator PBS, the service efficiency raising of light beam.
＜embodiment 3A 〉
For example, hologram reproducing apparatus, hologram reproducing 16d shown in Figure 8 disposes LASER Light Source LD, optical gate SHs identical with the hologram reproducing apparatus, hologram reproducing 16a of explanation among the embodiment 1, that penetrate coherent light beam and optical beam expander BX and the light beam irradiates portion of first object lens 18a formation and the hologram record medium 14 of infiltration type on same light path.Further, the incident light processing unit 21 of the configuration first inverse Fourier transform lens 20a, the first half reflection prism HP1, the second object lens 18b and reflection-type on this light path.In addition, the first inverse Fourier transform lens 20a and the coaxial configuration of the first object lens 18a.
The first half reflection prism HP1 is configured to see through the light beam that advances from the first inverse Fourier transform lens 20a skidding, and vertically reflects the light beam that advances from the second object lens 18b skidding.In addition, configuration makes it can receive the light that reflects by the first half reflection prism HP1 as detecting sensor 22.To be connected to demoder 23 as detecting sensor 22, demoder 23 will be connected to controller.
The incident light processing unit 21 of reflection-type is configured on the spot position by the second object lens 18b optically focused, comprises by at least one eigenwert in reflectivity, absorptivity and the transmitance to depend on the light intensity of incident beam and optical element that the photochromics that changes constitutes.As photochromics, the reflecting material of the photosensitivity of the characteristic value that the reflectivity of the non-reflex time of luminance factor when having used the irradiation with light beam is low.
As the reflecting material of photosensitivity, phase-change material, semiconductor microactuator particle material and reflective look material (inverse photochromic material), thermochromic materials etc. are arranged.
The phase-change material usually irradiation of the non-irradiation or the not enough predetermined light intensity (time) is opaque, but temperature height at beam center, surpassed phase transformation in the zone of certain temperature and become transparent, if temperature reduces, then phase transformation and return to original opaque state once more.For example, can enumerate antimony etc.
The semiconductor microactuator particle material usually irradiation of the non-irradiation or the not enough predetermined light intensity (time) be opaque, but only at the temperature height of beam center, has surpassed in the zone of certain temperature to become transparent, if the temperature reduction then turns back to original opaque state.
The reflective look material usually irradiation of the non-irradiation or the not enough predetermined light intensity (time) be opaque, but because of the absorption of illumination beam (core that intensity is strong) becomes unsettled pellucidity, the weakened as if light beam then returns to original opaque state.
The part of the thermochromic materials usually irradiation of the non-irradiation or the not enough predetermined light intensity (time) be opaque, but only at the temperature height of beam center, surpassed become in the zone of certain temperature transparent, if the temperature reduction then returns to original opaque state.
The incident light processing unit 21 that comprises the reflecting material of this photosensitivity is passed through on the strong position of the intensity of incident beam, and the transmitance of incident light processing unit R is higher than common, thereby the reflection strength of light beam is reduced.By adopting this effect, the incident light processing unit of reflection-type can be contributed and be 0 light that separates reconstruction beam and diffraction light.
In aforesaid hologram reproducing apparatus, hologram reproducing 16d, the method that is used to be reproduced in the information data that writes down on the hologram record medium comprises: will shine the irradiation process of the recording medium portion (not shown) of hologram record medium 14 from the light beam 17 of LASER Light Source LD through optical gate SHs, optical beam expander BX, the first object lens 18a.Derive corresponding to the reconstruction beam 19 of the diffraction grating that is write down from the hologram record medium generation of having shone reference beam.
In the incident light processing unit 21 of reconstruction beam pre-irradiation (Fig. 9 (a)), incident light processing unit 21 uniformly has high reflectivity.In the part that is in the incident light processing unit 21 on the converged position of the reconstruction beam after assembling (0 light and diffraction light), playback light is separated into the Fourier composition by the second object lens 18b.With the unmodulated composition in the reconstruction beam, promptly reference light (composition) is focused at the core R1 (Fig. 9 (b)) of incident light processing unit 21, and forms the high part of light intensity.Component distributing after the modulation in the reconstruction beam is in the outside of the core R1 of incident light processing unit 21, and light intensity is less high.If the threshold value TH that the reflectivity of incident light processing unit 21 is reduced is set between the light intensity of the light intensity of R1 part and periphery, then can only make unmodulated composition, promptly the reference light composition reduces.Like this, reflection diffracting light only, and import in the picture detecting sensor 22 through the second object lens 18b and the first half reflection prism HP1.At this moment, the second object lens 18b act as the inverse Fourier transform lens.If picture detecting sensor 22 receives the dot pattern picture that the diffraction light by reconstruction beam forms, and after being converted to electric digital signal once more, sends to demoder 23, then reproduce original data.By the action of aforesaid incident light processing unit 21, the light quantity of 0 light that reproduces unwanted playback light is reduced, and make the detection of information reproduction become easy.
In this example, the photochromics of the characteristic value that the reflectivity in the time of will having the luminance factor irradiation in non-when irradiation is high is used for incident light processing unit, is the material of at least one rising of reflectivity and transmitance when comparing irradiation during with non-irradiation and absorptivity but can also use this photochromics as can be seen.
＜embodiment 3B 〉
The hologram reproducing apparatus, hologram reproducing of embodiment 3B as shown in figure 10, except the first half reflection prism HP1 with hologram reproducing apparatus, hologram reproducing 16d shown in Figure 8 is replaced into polarizing beam splitter PBS, being provided with outside 1/4 wavelength plate λ/4 between the polarizing beam splitter PBS and the second object lens 18b, is the structure identical with the above embodiments 3A.It is also identical to reproduce operation.
By the separated part of separating the diffraction light of reconstruction beam by polarizing beam splitter PBS and the light path from reconstruction beam that 1/4 wavelength plate λ/4 constitute, the service efficiency raising of light beam are set.
＜embodiment 4A 〉
One example of the hologram reproducing apparatus, hologram reproducing that constitutes as the incident light processing unit of hologram record medium that use reflection-type and reflection-type has hologram recorder 16f as shown in figure 11.
The light beam irradiates portion that hologram recorder 16f disposes on same light path is identical with the hologram reproducing apparatus, hologram reproducing 16b that illustrates among the embodiment 2A, be made of LASER Light Source LD, the optical gate SHs, optical beam expander BX, the first half reflection prism HP1 and the first object lens 18a that penetrate coherent light beam and the hologram record medium 14 of reflection-type.In addition, hologram reproducing apparatus, hologram reproducing 16f has the playback light guide portion that comprises the second half reflection prism HP2 that further vertically reflects the reconstruction beam that vertically reflects by relative this light path in first half reflection prism HP1 edge.The playback light guide portion comprise to the playback light by second half reflection prism HP2 reflection carry out optically focused the second object lens 18b, be configured in the incident light processing unit 21 of the locational reflection-type by the second object lens 18b optically focused and receive the picture detecting sensor 22 of diffraction light of the reconstruction beam of incident light processing unit 21 reflections by reflection-type.In addition, in the playback light guide portion, the diffraction light of playback light sees through the second object lens 18b and the second half reflection prism HP2, and by accepting light as detecting sensor 22.
In aforesaid hologram reproducing apparatus, hologram reproducing 16f, the method that is reproduced in the information data of record on the hologram record medium 14 comprises: will shine the irradiation process of the hologram record medium portion 14 of reflection-type from the light beam of LASER Light Source LD through optical gate SHs, optical beam expander BX, the first half reflection prism HP1 and the first object lens 18a.Hologram record medium portion 14 passes through the irradiation reference beam, and generates the reconstruction beam (diffraction light after reference light and the reproduction) corresponding to the diffraction grating that is write down, and derives this reconstruction beam to the direct of travel opposite with the incident direct of travel of reference beam.This reconstruction beam is directed to the first object lens 18a and the first half reflection prism HP1, and vertically reflects by the first half reflection prism HP1.Reconstruction beam after the reflection incides the second half reflection prism HP2, and further reflects along the relative vertical direction of incident direction by the second half reflection prism HP2.This reconstruction beam is assembled by the second object lens 18b.The incident light processing unit 21 of the reflection-type that disposes on spot position reduces the reflectivity of the part of 0 light that has shone playback light and sees through or absorb light 0 time, and makes the diffraction light reflection, separates the incident light treatment process of 0 light and diffraction light.Diffraction light after the reflection imports to picture detecting sensor 22 through the second object lens 18b, the second half reflection prism HP2.Picture detecting sensor 22 receives the dot pattern picture that the diffraction light by reconstruction beam forms, and after being converted to electric digital data signal again, sends to demoder 23, has then reproduced original data.
＜embodiment 4B 〉
The hologram reproducing apparatus, hologram reproducing of embodiment 4B as shown in figure 12, except the first half reflection prism HP1 with hologram reproducing apparatus, hologram reproducing 16f shown in Figure 11 is replaced into the first polarizing beam splitter PBS1, and between the first polarizing beam splitter PBS1 and the first object lens 18a, 1/4 wavelength plate λ/4 are set, and the second half reflection prism HP2 is replaced into the second polarizing beam splitter PBS2, and between the second polarizing beam splitter PBS2 and the second object lens 18b, be provided with outside 1/4 wavelength plate λ/4, be the structure identical with the hologram reproducing apparatus, hologram reproducing of the above embodiments 4A.It is also identical to reproduce operation.
By polarizing beam splitter and 1/4 wavelength plate are set on the light path of reconstruction beam, the service efficiency of light beam improves, and improves as the light quantity of the diffraction light of the reconstruction beam in the detecting sensor.
In any one embodiment shown in the embodiment 1 to 4B, incident light processing unit is carried out following action in the high zone of beam intensity: promptly, transmitance is reduced, the action that reflectivity is reduced.0 light and the diffraction light that have reproduced in the hologram record medium corresponding to the reconstruction beam of the signal of recorded information shine in the incident light processing unit.At this moment, between 0 light of reconstruction beam and the diffraction light light intensity difference is arranged, promptly wide by 0 light light strength ratio diffraction, incident light processing unit plays different effects in 0 light and diffraction light.
Under the situation of the incident light processing unit of infiltration type (embodiment 1, embodiment 2A, embodiment 2B), in incident light processing unit, the scope of having shone 0 light reduces by making transmitance, and the light quantity that arrives the lens that carry out inverse Fourier transform reduces.On the other hand, because the scope transmitance that diffraction light shone still is height, thus decay hardly, and import to the lens that carry out inverse Fourier transform.
Under the situation of the incident light processing unit of reflection-type (embodiment 3A, embodiment 3B, embodiment 4A, embodiment 4B), in incident light processing unit, the scope reflectivity that has shone 0 light reduces, and the light quantity that arrives the lens that carry out inverse Fourier transform reduces.On the other hand, because the light-struck scope reflectivity of diffraction still is high, thus decay hardly, and import to the lens that carry out inverse Fourier transform.
By the action of aforesaid incident light processing unit, the light quantity of reproducing unwanted reference light is reduced, it is easy that the detection of information reproduction becomes.Further, owing on incident light processing unit, there is not the zone of delimiting in advance,, simultaneously, make the diffraction of boundary and the noise minimizing that scattering causes to reproducing signal so do not need the processing of fine structure.
＜embodiment 5A 〉
As the replacement of the incident light processing unit of the above embodiments, also can use the incident light processing unit of 0 light reflecting portion that is provided with the reconstruction by reflection light beam.
For example, shown in Figure 13 (a), incident light processing unit 24a comprise the circle that constitutes by catoptrical light reflecting material reflecting part 25a and by the translucent material that sees through light that around reflecting part, forms constitute through the 26a of portion.The position of reflecting part 25a and size use the light quantity distribution of the playback light behind the Fourier transform to decide, and reflecting part 25a not have the size of shining corresponding to 0 light more than the predetermined light quantity of reflection and by diffraction light.The incident light processing unit that below the incident light processing unit 24a of this structure is called 0 light reflection-type.
The shape of reflecting part 25a is not limited to circle, for example can be rectangle, triangle, pentagon, 6 limit shapes, 8 limit shapes.
Hologram reproducing apparatus, hologram reproducing with incident light processing unit of aforesaid 0 light reflection-type, the center of reflecting part that preferably has the incident light processing unit of making are with optically focused on incident light processing unit and the optical axis of the optical axis unanimity of the reconstruction beam of incident coupling (direction in the face that optical axis is vertical relatively) and make 0 light optically focused mate the unit of (direction parallel with optical axis) to the focus at the center of reflecting part.That is, because the light quantity of 0 light is big near the optical axis of 0 light of reconstruction beam, so by making this optical axis and near 0 light reflection thereof and separate with the diffraction light of playback light, thereby make the detection of the record data that comprise in the diffraction light become easy.
Hologram reproducing apparatus, hologram reproducing one for example shown in Figure 14 with incident light processing unit of 0 light reflection-type.Hologram apparatus 16h has roughly the same structure with the hologram reproducing apparatus, hologram reproducing 16a shown in the embodiment 1 except that following aspect.Promptly, compare with the hologram reproducing apparatus, hologram reproducing 16a of Fig. 4, at the incident light processing unit 24a that the incident light processing unit 21 of infiltration type is replaced into 0 light reflection-type, between the first inverse Fourier transform lens 20a and the second object lens 18b, see through from the light of the first inverse Fourier transform lens 20a side incident and vertically reflect from the first half reflection prism HP1 of the light of the second object lens 18b side incident, reception is from the test section 27 of the light of first half reflection prism HP1 reflection, first drive division 28 that the position of incident light processing unit is moved according to detection signal from test section 27, the second drive division 29a that the position of the second object lens 18b and the second inverse Fourier transform lens 20b is moved according to detection signal from test section 27,29b aspect difference.
First and second drive divisions 28,29a, 29b are connected to this controller, slave controller receives the drive signal corresponding to this detection signal, according to this drive signal, first drive division 28 moves incident light processing unit 24, and the second drive division 29a, 29b move the second object lens 18b and the second inverse Fourier transform lens 20b respectively.
The reproducting method of the recording information data among the hologram reproducing apparatus, hologram reproducing 16h of structure comprises as mentioned above: the irradiation process that will shine to hologram record medium 14 through optical gate SHs, optical beam expander BX, the first object lens 18a from the light beam of LASER Light Source LD.From the hologram record medium 14 that shone reference beam, generate the reconstruction beam (0 light and the diffraction light that is reproduced) of the diffraction grating that writes down corresponding to recording medium portion (not shown) at the hologram record medium.After reconstruction beam generates, this reconstruction beam imported among the first inverse Fourier transform lens 20a carry out inverse Fourier transform, and see through the first half reflection prism HP1, come to carry out optically focused to assembling locational optically focused operation by the second object lens 18b.After the optically focused operation, carry out the reconstruction beam of institute's optically focused is shone incident light processing unit 24a, 0 light of reconstruction beam is reflected in the reflecting part (not shown) of incident light processing unit 24a, and makes the incident light treatment process that see through portion (not shown) of the diffraction light of reconstruction beam through incident light processing unit 24a.
0 light that reflects in this reflecting part of incident light processing unit 24a is directed with the order of the second object lens 18b, the first half reflection prism HP1, and vertically reflects from the optical axis of reconstruction beam in the first half reflection prism HP1.0 light after the reflection is incided in the test section 27, detect the light quantity of this 0 light.Control first and second drive divisions 28,29a, 29b by servo control mechanism, make the light quantity maximum of 0 light, and the position of location incident light processing unit 24a.
Behind the location of having carried out aforesaid incident light processing unit 24a, the second object lens 18b and the second inverse Fourier transform lens 20b, the diffraction light that should see through the reconstruction beam of portion that will see through incident light processing unit 24a incides in the picture detecting sensor 22.Picture detecting sensor 22 receives the dot pattern picture that the diffraction light by reconstruction beam forms, and after being converted to electric digital data signal again, delivers to demoder 23, then reproduces original data.
＜embodiment 5B 〉
Location matches between the optical axis of 0 light of the center of the reflecting part of incident light processing unit and playback light also can be undertaken by the position that detects the reconstruction beam that incides incident light processing unit.
For example, as shown in figure 15, hologram reproducing apparatus, hologram reproducing 16i has roughly the same structure with the hologram reproducing apparatus, hologram reproducing 16h shown in the embodiment 5A except that following aspect.Promptly, compare with hologram reproducing apparatus, hologram reproducing 16h as shown in figure 14, omit to detect from the first half reflection prism HP1 incident of the second object lens 18b side direction and vertically the light of reflection test section 27, after the lens 30 that the light from first half reflection prism HP1 incident of the first inverse Fourier transform lens 20b side direction and vertically reflection carried out optically focused being set and detecting this optically focused light test section 27 aspect different.Test section 27 is for example cut apart detecting device by 4 of the pick-up that is used for CD and is constituted, and detection signal is supplied with detection signal treatment circuit in the controller (not shown).
First and second drive divisions 28,29a, 29b are connected to controller, and from the drive signal of this controller reception corresponding to this detection signal, and according to this drive signal, first drive division 28 moves incident light processing unit 24a, and the second drive division 29a, 29b move the second object lens 18b and the second inverse Fourier transform lens 20b respectively.
The reproducting method of the recording information data among the hologram reproducing apparatus, hologram reproducing 16i of structure comprises as mentioned above: will shine the operation of hologram record medium 14 from the light beam of LASER Light Source LD through optical gate SHs, optical beam expander BX, the first object lens 18a.By reference beam being shone hologram record medium 14, generate corresponding to the reconstruction beam of the diffraction grating of record on the hologram record medium 14 (0 light and reproduce after diffraction light).This reconstruction beam imported among the first inverse Fourier transform lens 20a carry out inverse Fourier transform, and shine among the first half reflection prism HP1.The first half reflection prism HP1 is separated into along the composition of the incident light axis vertical direction reflection of the reconstruction beam of institute's incident relatively and the composition that sees through along this optical axis.
Vertically Fan She reconstruction beam composition is received by test section 27 through lens 30, and detects the position of reconstruction beam according to the detection signal from test section 27.According to the position of this reconstruction beam, the position of incident light processing unit 24a positions by first drive division 28, and the position of the second object lens 18b and the second inverse Fourier transform lens 20b positions respectively by the second drive division 29a, 29b.
The reconstruction beam composition that sees through the first half reflection prism HP1 along optical axis carries out optically focused by the second object lens 18b after locating.Reconstruction beam behind the optically focused is shone among the incident light processing unit 24a, 0 light of reconstruction beam reflects in the reflecting part (not shown) of incident light processing unit 24a, and what the diffraction light of reconstruction beam saw through incident light processing unit 24a sees through portion's (not shown).That is, separated among 0 of reconstruction beam light and the incident light processing unit 24a of diffraction light behind aforesaid location.
The second inverse Fourier transform lens 20b of diffraction light behind the location that has seen through the reconstruction beam that should see through portion of incident light processing unit 24a incides in the picture detecting sensor 22.Picture detecting sensor 22 receives the dot pattern picture that the diffraction light by reconstruction beam forms, and after being converted to electric digital signal again, delivers to demoder 23, then reproduces original data.
＜embodiment 6A 〉
As the replacement of the incident light processing unit that illustrates among embodiment 5A and the 5B, also can use the incident light processing unit that sees through portion that is provided with through 0 light of reconstruction beam with 0 light reflecting portion of reflection.
For example, shown in Figure 13 (b), incident light processing unit 24b comprises the reflecting part 26b that sees through the 25b of portion and be made of the catoptrical reflecting material that forms of the circle that is made of the translucent material that sees through light around the portion of seeing through.Below, the incident light processing unit 24b of this structure is called the incident light processing unit of 0 light transmission type.
The reflecting part 25a of the incident light processing unit 24a of the reflection-type that illustrates among the position that sees through the 25b of portion of the incident light processing unit 24b of 0 light transmission type and size and the embodiment 5A is identical, and the light quantity distribution of the playback light behind the use Fourier transform decides.In addition, the shape that sees through the 25b of portion is not limited to circle, can be for example rectangle, triangle, 5 limit shapes, 6 limit shapes, 8 limit shapes.
Hologram reproducing apparatus, hologram reproducing with incident light processing unit of aforesaid 0 light reflection-type, center and the optically focused of the portion that sees through that preferably has the incident light processing unit of making are on incident light processing unit and the optical axis of the optical axis unanimity of the reconstruction beam of incident coupling (direction in the face that optical axis is vertical relatively) and make 0 light optically focused unit to the focus coupling (direction parallel with optical axis) at the center of the portion of seeing through.
Hologram reproducing apparatus, hologram reproducing one for example shown in Figure 16 with incident light processing unit of 0 light transmission type.Hologram apparatus 16j has roughly the same structure with the hologram reproducing apparatus, hologram reproducing 16h shown in the embodiment 5A except that following aspect.Promptly, be replaced into the incident light processing unit 24b of 0 light transmission type at incident light processing unit 24a with 0 light reflection-type, and omit the second inverse Fourier transform lens 20b, and replace as detecting sensor 22 with test section 27 and the aspect that forms is different with hologram reproducing apparatus, hologram reproducing 16h.
The test section 27, first and second drive divisions 28, the 29a that are provided with on hologram reproducing apparatus, hologram reproducing 16j constitute servo control mechanism, first drive division 28 moves incident light processing unit 24b, the second drive division 29a moves the second object lens 18b, make the light quantity maximum of 0 light being received by test section 27, that is, make the optical axis of 0 light of playback light consistent with the center that sees through light.
The reproducting method of the recording information data among the hologram reproducing apparatus, hologram reproducing 16j of structure comprises as mentioned above: the irradiation process that will shine to hologram record medium 14 through optical gate SHs, optical beam expander BX, the first object lens 18a from the light beam of LASER Light Source LD.From the hologram record medium 14 that shone reference beam, generate the reconstruction beam (0 light and the diffraction light that is reproduced) of the diffraction grating that writes down corresponding to recording medium portion (not shown) at the hologram record medium.Carry out this reconstruction beam imported among the first inverse Fourier transform lens 20a and carry out inverse Fourier transform, and see through the first half reflection prism HP1, the optically focused operation of coming to be undertaken optically focused by the second object lens 18b.Carry out the reconstruction beam of institute's optically focused is shone incident light processing unit 24a, make reconstruction beam 0 light transmission incident light processing unit 24b see through portion's (not shown), and the diffraction light of reconstruction beam is reflected in the reflecting part (not shown) of incident light processing unit 24b.
0 light that has seen through the reconstruction beam that sees through portion of incident light processing unit 24b incides test section 27, and detects the light quantity of this 0 light.Control first and second drive divisions 28,29a by servo control mechanism, make the light quantity maximum of 0 light, thus the position of the location incident light processing unit 24b and the second object lens 18b.
Will be by the diffraction light of the reconstruction beam after the reflection of the reflecting part of incident light processing unit 24b from the second object lens 18b that carried out the location to the first half reflection prism HP1 channeling conduct, and in the first half reflection prism HP1, reflect along the vertical direction of direct of travel of reconstruction beam relatively.Diffraction light after the reflection is incided in the picture detecting sensor 22.Picture detecting sensor 22 receives the dot pattern picture that the diffraction light by reconstruction beam forms, and after being converted to electric digital data signal once more, sends to demoder 23, then reproduces original data.
＜embodiment 6B 〉
Location matches between the optical axis of 0 light of the center of the reflecting part of incident light processing unit and playback light can be undertaken by detecting to the position of the reconstruction beam of incident light processing unit incident.
For example, as shown in figure 17, hologram reproducing apparatus, hologram reproducing 16k has roughly the same structure with the hologram reproducing apparatus, hologram reproducing 16i shown in the embodiment 5B except following aspect.Promptly, compare with hologram reproducing apparatus, hologram reproducing 16i as shown in figure 15, omitting the second inverse Fourier transform lens 20b, will be from the prolongation that connects the second object lens 18b and the light path of incident light processing unit 24a, to from the first half reflection prism HP1 incident of the second object lens 18b side direction and vertically the aspect that changes of the light path of the light of reflection is different as the position of detecting sensor 22.Test section 27 is for example cut apart detecting device by 4 of the pick-up that is used for CD and is constituted, and the detection signal treatment circuit in controller provides detection signal.
First and second drive divisions 28,29a, 29b are connected to controller, and from the drive signal of this controller reception corresponding to this detection signal, and according to this drive signal, first drive division 28 moves incident light processing unit 24b, and the second drive division 29a moves the second object lens 18b.
The reproducting method of the recording information data among the hologram reproducing apparatus, hologram reproducing 16k of structure comprises as mentioned above: will shine the irradiation process of hologram record medium 14 from the light beam of LASER Light Source LD through optical gate SHs, optical beam expander BX and the first object lens 18a.From the hologram record medium 14 that shone reference beam, generate reconstruction beam corresponding to the diffraction grating that writes down in recording medium (0 light and reproduce after diffraction light).This reconstruction beam imported among the first inverse Fourier transform lens 20a carry out inverse Fourier transform, and shine among the first half reflection prism HP1.The first half reflection prism HP1 is separated into the reconstruction beam of institute's incident along the composition of the vertical direction reflection of the incident light axis of reconstruction beam relatively and the composition that sees through along this optical axis.
Vertically Fan She reconstruction beam composition is received by test section 27 through lens 30, and detects the position of reconstruction beam according to the detection signal from test section 27.According to the position of this reconstruction beam, the position of incident light processing unit 24b positions by first drive division 28, and the position of the second object lens 18b positions by the second drive division 29a.
The reconstruction beam composition that sees through the first half reflection prism HP1 along optical axis carries out optically focused by the second object lens 18b after locating.Reconstruction beam behind the optically focused is shone among the incident light processing unit 24b, and 0 light transmission incident light processing unit 24a of reconstruction beam sees through portion's (not shown), and the diffraction light of reconstruction beam reflects in incident light reflecting part (not shown).That is, 0 of reconstruction beam light and diffraction light are separated in by the incident light processing unit 24b behind the aforesaid location.
Diffraction light by the reconstruction beam after this reflecting part reflection of incident light processing unit 24b, be directed with the second object lens 18b that has located, the order of the first half reflection prism HP1, and reflect along the vertical direction of direct of travel of reconstruction beam relatively in the first half reflection prism HP1.Diffraction light after the reflection is incided in the picture detecting sensor 22.Picture detecting sensor 22 receives the dot pattern picture that the diffraction light by reconstruction beam forms, and after being converted to electric digital signal again, delivers to demoder 23, then reproduces original data.
＜other hologram record medium 〉
The program pen recorder that program record medium in the above embodiments is recited as by as shown in Figure 3 comes recorded information, but is not limited to this.That is, applicable to hologram record medium of the present invention, so long as the hologram record medium that generate the reconstruction beam that comprises roughly 0 light of advancing along same optical axis and diffraction light by irradiation reference beam (0 light) get final product.
For example, can be suitable for the hologram record medium that come recorded information by hologram recorder as shown in figure 18.
Hologram recorder disposes LASER Light Source LD, optical gate SHs, beam splitter BX, spatial light modulator SLM and fourier transform lens 13 backs and forms on same optical axis.
Hologram recorder makes the light beam 11 that penetrates from LASER Light Source LD see through with the order that sees through optical gate SHs, optical beam expander BX and spatial light modulator SLM.Spatial light modulator SLM receives the luminous point matrix signal that shows light and shade from the two-dimentional dot pattern data of demoder 12 supplies, light beam 11 is by spatial light modulator SLM, thereby comprise the flashlight composition (diffraction light) after the optical modulation, but also can also comprise reference light composition (0 light).Therefore, hologram recorder as shown in Figure 3 is such, even do not use signal beams and reference beam respectively, also produces and interferes.
After reference beam and signal beams carried out Fourier transform by fourier transform lens 13,0 light component and diffraction light component formed light interference pattern in the recording medium portion (not shown) of hologram record medium 14.This recording medium portion distributes according to the light intensity in the light interference pattern and makes variations in refractive index write down diffraction grating area.
In addition, the corrugated of light beam that is not limited to be used for the record of hologram is the situation of sphere (converging light).
＜other hologram reproducing apparatus, hologram reproducing 〉
In the foregoing description, the also configurable focus rear of hologram record medium at fourier transform lens.
In the foregoing description, be that example is illustrated with hologram reproducing method and hologram reproducing apparatus, hologram reproducing, but the present invention obviously comprise hologram recording method, hologram recorder and hologram recording recording/reproduction apparatus.For example, by the hologram record portion that comprises spatial light modulator is set, can obtain the hologram recording recording/reproduction apparatus in light beam irradiates portion.
According to hologram reproducing apparatus, hologram reproducing of the present invention, to on roughly the same optical axis, comprise relevant reference light composition and according to the recorded information writing light beam of modulated signal light composition spatially, shine to recording medium, and reproduce this recorded information from the diffraction grating area that has write down the interference between this reference light composition and this flashlight composition, it is characterized in that comprising: the light source portion that penetrates coherent light beam; Shine the light beam irradiates portion of this light beam to this diffraction grating area of this recording medium; Will be by the reconstruction beam that this light beam reproduced to the irradiation of this diffraction grating area light collecting part to converged position optically focused; On this converged position, be provided with and separate the incident light separated part of the diffraction light component of 0 composition of Fourier of this reconstruction beam and this reconstruction beam; With the test section that from this diffraction light component, detects this recorded information, therefore can be in incident light processing unit, from reconstruction beam, separate 0 light, so can make the S/N ratio of the reproducing signal that reproduces from the recorded information that writes down at the hologram record medium become good as the reason of the noise that comprises in the reproducing signal.
According to hologram reproducing method of the present invention, to on roughly the same optical axis, comprise relevant reference light composition and according to the recorded information writing light beam of modulated signal light composition spatially, shine to recording medium, and reproduce this recorded information from the diffraction grating area that has write down the interference between this reference light composition and this flashlight composition, it is characterized in that, comprise: the irradiation process that shines coherent light beam to this diffraction grating area of this recording medium; The reconstruction beam that will reproduce by this irradiation process is to the optically focused operation of converged position optically focused; The incident light separation circuit that separates the diffraction light component of 0 composition of Fourier of this reconstruction beam and this reconstruction beam by the incident light processing unit that on this converged position, is provided with; With the reproduction operation of reproducing this recorded information from this diffraction light component, therefore can in the incident light processing unit operation, from reconstruction beam, separate and compare 0 time big light of light quantity with diffraction light, so, detect the diffraction light that is carrying the information that has write down on the hologram record medium and become easy.
Claims (15)
1, a kind of hologram reproducing apparatus, hologram reproducing, to on roughly the same optical axis, comprise relevant reference light composition and shone to recording medium by the writing light beam of the flashlight composition of spatial modulation according to recorded information, to reproduce above-mentioned recorded information from the diffraction grating area that has write down the interference between above-mentioned reference light composition and the above-mentioned flashlight composition, it is characterized in that, comprising:
Light source portion penetrates relevant light beam;
Described light beam is shone to the described diffraction grating area of described recording medium in light beam irradiates portion;
Light collecting part will be by shining reconstruction beam that described light beam reproduces to converged position optically focused to described diffraction grating area;
Incident light processing unit is provided with on described converged position, and separates 0 composition of Fourier of described reconstruction beam and the diffraction light component of described reconstruction beam; With
Test section detects described recorded information from described diffraction light component.
2, hologram reproducing apparatus, hologram reproducing according to claim 1 is characterized in that:
The optical element of the characteristic value that the transmitance when described incident light processing unit comprises transmitance when having by 0 composition irradiation of the described Fourier of described reconstruction beam than non-irradiation is low.
3, hologram reproducing apparatus, hologram reproducing according to claim 1 is characterized in that:
The optical element of the characteristic value that the reflectivity when described incident light processing unit comprises the non-irradiation of luminance factor when having by 0 composition irradiation of the described Fourier of described reconstruction beam is low.
4, hologram reproducing apparatus, hologram reproducing according to claim 1 is characterized in that:
Described incident light processing unit has: reflect described reconstruction beam 0 composition of described Fourier reflecting part and see through the portion that sees through of the described diffraction light component of described reconstruction beam.
5, hologram reproducing apparatus, hologram reproducing according to claim 1 is characterized in that:
Described incident light processing unit has: the seeing through portion and reflect the reflecting part of the described diffraction light component of described reconstruction beam of 0 composition of described Fourier that sees through described reconstruction beam.
6, according to claim 4 or 5 described hologram reproducing apparatus, hologram reproducings, it is characterized in that:
Comprise:
The optical axis test section detects the position of the optical axis of described reconstruction beam; With
Drive division based on the position of the detected optical axis of described optical axis test section, moves described light collecting part and described incident light processing unit.
7, hologram reproducing apparatus, hologram reproducing according to claim 6 is characterized in that:
Described optical axis test section receives 0 composition of described Fourier of described reconstruction beam.
8, a kind of hologram reproducing method, to on roughly the same optical axis, comprise relevant reference light composition and shone to recording medium by the writing light beam of the flashlight composition of spatial modulation according to recorded information, to reproduce above-mentioned recorded information from the diffraction grating area that has write down the interference between above-mentioned reference light composition and the above-mentioned flashlight composition, it is characterized in that, comprising:
Irradiation process is to the relevant light beam of described diffraction grating area irradiation of described recording medium;
The optically focused operation, the reconstruction beam that will reproduce by described irradiation process is to converged position optically focused;
The incident light treatment process by the incident light processing unit that is provided with at described converged position, is separated 0 composition of Fourier of described reconstruction beam and the diffraction light component of described reconstruction beam; With
Reproduce operation, from described diffraction light component, reproduce described recorded information.
9, hologram reproducing method according to claim 8 is characterized in that:
The optical element of the characteristic value that the transmitance when described incident light processing unit comprises transmitance when having by 0 composition irradiation of the described Fourier of described reconstruction beam than non-irradiation is low.
10, hologram reproducing method according to claim 8 is characterized in that:
The optical element of the characteristic value that the reflectivity when described incident light processing unit comprises the non-irradiation of luminance factor when having by 0 composition irradiation of the described Fourier of described reconstruction beam is low.
11, hologram reproducing method according to claim 8 is characterized in that:
Described incident light processing unit has: reflect described reconstruction beam 0 composition of described Fourier reflecting part and see through the portion that sees through of the described diffraction light component of described reconstruction beam.
12, hologram reproducing method according to claim 11 is characterized in that:
Described incident light treatment process comprises:
Optical axis detects operation, detects the position of the optical axis of described reconstruction beam; With
The location matches operation detects the position of detected described optical axis in the operation based on described optical axis, makes location matches between the optical axis of 0 composition of described Fourier and the described reflecting part.
13, hologram reproducing method according to claim 8 is characterized in that:
Described incident light processing unit has: the seeing through portion and reflect the reflecting part of the described diffraction light component of described reconstruction beam of 0 composition of described Fourier that sees through described reconstruction beam.
14, hologram reproducing method according to claim 13 is characterized in that:
Described incident light treatment process comprises:
Optical axis detects operation, detects the position of the optical axis of described reconstruction beam; With
The location matches operation detects the position of detected described optical axis in the operation based on described optical axis, makes the optical axis of 0 composition of described Fourier and described through location matches between the portion.
15, according to claim 12 or 14 described hologram reproducing methods, it is characterized in that:
Described optical axis detects operation and comprises: the operation that receives 0 composition of described Fourier of described reconstruction beam.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004106185 | 2004-03-31 | ||
| JP106185/2004 | 2004-03-31 |
Publications (1)
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| CN1961263A true CN1961263A (en) | 2007-05-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800176525A Pending CN1961263A (en) | 2004-03-31 | 2005-03-15 | Hologram reproduction device and hologram reproduction method |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20080239419A1 (en) |
| EP (1) | EP1734417A4 (en) |
| JP (1) | JPWO2005098552A1 (en) |
| CN (1) | CN1961263A (en) |
| WO (1) | WO2005098552A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149827A (en) * | 2013-02-28 | 2013-06-12 | 山东大学 | Method for eliminating single-beam coaxial digital holography direct current terms and conjugate images |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090196145A1 (en) * | 2007-12-11 | 2009-08-06 | Kabushiki Kaisha Toshiba | Optical information recording/reproducing apparatus, optical information reproducing apparatus, and optical information recording medium |
| JP5053193B2 (en) * | 2008-07-17 | 2012-10-17 | 新日本製鐵株式会社 | Particle size measuring apparatus and particle size measuring method |
| JP5847568B2 (en) * | 2011-12-15 | 2016-01-27 | Ckd株式会社 | 3D measuring device |
| TWI456778B (en) * | 2012-05-28 | 2014-10-11 | Univ Nat Chiao Tung | Holographic light-collecting component and fabrication method thereof |
| WO2014064636A2 (en) * | 2012-10-24 | 2014-05-01 | Csir | Modal decomposition of a laser beam |
| BR122020013722B1 (en) * | 2013-07-30 | 2022-12-27 | Dolby Laboratories Licensing Corporation | PROJECTOR DISPLAY SYSTEM HAVING NON-MECHANICAL MIRROR BEAM DIRECTION |
| CZ306015B6 (en) * | 2014-10-20 | 2016-06-22 | Vysoké Učení Technické V Brně | Interferometric system and method of measuring of refraction index spatial distribution |
| KR20210143823A (en) * | 2019-03-20 | 2021-11-29 | 매튜 이. 워드 | MEMS driven optical package with micro LED array |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3253791B2 (en) * | 1994-02-25 | 2002-02-04 | 三菱電機株式会社 | Fourier transform optical system |
| JP3519778B2 (en) * | 1994-05-16 | 2004-04-19 | シチズン時計株式会社 | Optical imaging device |
| US5671073A (en) * | 1995-02-15 | 1997-09-23 | California Institute Of Technology | Holographic storage using shift multiplexing |
| US5986781A (en) * | 1996-10-28 | 1999-11-16 | Pacific Holographics, Inc. | Apparatus and method for generating diffractive element using liquid crystal display |
| US5838467A (en) * | 1997-06-03 | 1998-11-17 | Lucent Technologies Inc. | Method for processing information stored in a holographic system |
| US6731819B1 (en) * | 1999-05-21 | 2004-05-04 | Olympus Optical Co., Ltd. | Optical information processing apparatus capable of various types of filtering and image processing |
| JP2001194624A (en) * | 2000-01-14 | 2001-07-19 | Olympus Optical Co Ltd | Image processor |
| JP3611756B2 (en) * | 1999-08-31 | 2005-01-19 | パイオニア株式会社 | Hologram recording apparatus and method thereof |
| DE10085411B3 (en) * | 2000-01-19 | 2017-03-02 | Hamamatsu Photonics K.K. | Laser light processing device with a spatial light modulator |
| JP2001272636A (en) * | 2000-01-19 | 2001-10-05 | Hamamatsu Photonics Kk | Laser beam machining device |
| US6909529B2 (en) * | 2001-07-31 | 2005-06-21 | Inphase Technologies, Inc. | Method and apparatus for phase correlation holographic drive |
| AU2003252729A1 (en) * | 2002-08-01 | 2004-02-23 | Pioneer Corporation | Hologram recording/reproducing method and hologram recording/reproducing device |
-
2005
- 2005-03-15 EP EP05721209A patent/EP1734417A4/en not_active Withdrawn
- 2005-03-15 WO PCT/JP2005/005059 patent/WO2005098552A1/en active Application Filing
- 2005-03-15 US US10/594,588 patent/US20080239419A1/en not_active Abandoned
- 2005-03-15 JP JP2006511983A patent/JPWO2005098552A1/en active Pending
- 2005-03-15 CN CNA2005800176525A patent/CN1961263A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149827A (en) * | 2013-02-28 | 2013-06-12 | 山东大学 | Method for eliminating single-beam coaxial digital holography direct current terms and conjugate images |
| CN103149827B (en) * | 2013-02-28 | 2015-05-20 | 山东大学 | Method for eliminating single-beam coaxial digital holography direct current terms and conjugate images |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2005098552A1 (en) | 2005-10-20 |
| EP1734417A4 (en) | 2009-05-27 |
| US20080239419A1 (en) | 2008-10-02 |
| EP1734417A1 (en) | 2006-12-20 |
| JPWO2005098552A1 (en) | 2008-02-28 |
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